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Table 3 Inhibition zone (mm) showing antibacterial activities of volatile oils and ciprofloxacin against bacterial test organisms

From: Terpene constituents of the aerial parts, phenolic content, antibacterial potential, free radical scavenging and antioxidant activity of Callistemon citrinus (Curtis) Skeels (Myrtaceae) from Eastern Cape Province of South Africa

Microorganism Positive control Zone of inhibition of volatile oils and standard drug
Concentration Ciprofloxacin (mgmL-1) Leaves volatile oil (mgmL-1) Flowers volatile oil (mgmL-1)
0.4 0.1 0.025 0.4 0.1 0.025 0.4 0.1 0.025
Gram negative Bacteria
Aeromonas hydrophilia ACC 34.0 ± 0.6 26.0 ± 2.0 20.0 ± 0.5 58.0 ± 0.3 44.0 ± 4.0 19.0 ± 0.6 52.0 ± 1.0 41.0 ± 1.0 15.0 ± 0.8
Escherichia coli ATCC 35150 38.0 ± 4.0 32.0 ± 4.0 24.0 ± 0.9 27.0 ± 3.0 18.0 ± 3.0 13.0 ± 3.0 20.0 ± 4.0 12.0 ± 4.0 10.0 ± 3.0
Vibro alginolyticus DSM 2171 33.0 ± 2.0 29.0 ± 2.0 23.0 ± 0.4 67.0 ± 2.0 48.0 ± 5.0 28.0 ± 4.0 60.0 ± 5.0 42.0 ± 0.8 23.0 ± 1.0
Salmonella typhi ACC 40.0 ± 1.0 34.0 ± 0.6 28.0 ± 3.0 53.0 ± 0.5 40.0 ± l.0 20.0 ± 2.0 48.0 ± 0.5 35.0 ± 2.0 14.0 ± 0.5
Gram positive Bacteria
Staphylococcal enteritis ACC 40.0 ± 5.0 32.0 ± 1.0 28.0 ± 0.2 62.0 ± 0.5 45.0 ± 0.1 25.0 ± 0.4 55.0 ± 2.0 38.0 ± 0.9 22.0 ± 0.9
Staphylococcus aureus ACC 29.0 ± 2.0 24.0 ± 0.0 17.0 ± 2.0 54.0 ± 4.0 26.0 ± 1.0 18.0 ± 2.0 53.0 ± 3.0 24.0 ± 5.0 16.0 ± 2.0
Listeria monocytogenes ACC 44.0 ± 6.0 38.0 ± 0.2 32.0 ± 1.0 54.0 ± 2.0 42.0 ± 2.0 21.0 ± 1.0 50.0 ± 2.0 39.0 ± 3.0 18.0 ± 3.0
  1. Zone of inhibition (millimeter), ACC Aemreg culture collection, ATCC American type collection center, values are mean ± SD, n = 3